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Aug. 23, 11923. 11,465,442

' R. E. JONES SLACK BURNING STOVE AND FURNACE Filed Sept. 1. 1922 Patented Aug. 211, 122

UNETEI) STATES PATENT ROBERT E. JONES, 0F EVERGREEN, CQLORADU.

SLACK-BURNING STUFF AND FURNACE.

Application filed September 1, 1922.

To all whom 2'25 may concern:

Be it known that 1, ROBERT E. citizen of the United States, residing at Evergreen, in the county of Jefierson and State of Colorado, have invented certain new and useful Improvements in Slack- Burning Stoves and Furnaces; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to stoves and has special reference to an improvement which J ones, a

makes it practical to burn slack coal.

In places where 'lignite and similar soft coal is employed in stoves and furnaces, considerable difliculty is experienced in 0btaining proper combustion when the fuel has become slacked, as lignite will after a considerable exposure to the air. When slack coal is employed in stoves such as are ordinarily used in heatin houses, gas explosions often take place and then the fire is often smothered by the application of new coal in considerable quantity. This is due to the fact that the fineness of the coal prevents the proper amount of air necessary for combustion from penetrating the coal, with the result that explosive gases are generated and .pass upwardly into the combustion chamber, where they become ignited from sparks or flames that escape from the bed of coal. When such a quantity of coal is applied at once that air cannot penetrate (tihe same, the fire will, as a matter of course,

It is the object of this invention to produce a stove that shall be so constructed that even when large quantitiesof slack coal are fed into the stove, the gases will not explode and the fire will not die. I

I accomplish the above objects by means which I Will hereinafter describe in detail, and which consists broadly in arranging the grate in such a manner that air may pass upwardly through the coal from the sides of a substantially spherical space and also through a tubular passage to the upper surface of the coal. where it will combine with the gases in the combustion chamber and cause the same to be gradually consumed so as to prevent an explosion. i

Serial No. 585,759.

In order to more clearly describe my invention, ll shall have reference to the accompanying drawing, in which- Fig. 1 is a vertical section of a stove constrlcted in accordance with this invention; an

Fig. 2 is a section taken on line 2-2, Fig. 1.

The same reference characters will be used to indicate the same parts in the several views.

Numeral 1 represents my improved stove as a whole, and 2 the combustion chamber, which is formed by a cast iron member 3, which rests on and is suitably secured to a base portion 4, which constitutes the ash pit 5. The stove is supported on suitable legs 6 in the usual manner. The part 4 is provided with the usual ash door opening 7, and the upper portion 3 is provided with a fuel door opening 8. A grate 9 rests on a suitable ledge 10 and supports the auxiliary grate, which consists of a base member 11, which has the general appearance of a seg ment of a hollow sphere. The lower edge of member 11 has supports 12, which rest upon the top of the grate so as to space the same from the upper surface of the grate. The sides of member 11 are perforated and are preferably formed with longitudinal slots 13 in the manner shown. The top of member 11 has an opening 14, which serves to receive the lower end of the tubular member 15.

Member 15 has an outwardly extending bead 16, which serves to hold it in place on the member 11, and is provided at its top with a removable cap 17, which is semispherical in shape and has a number of perforations 18, through which the air and gases may pass. The lower end of member 17 has a downwardly extending flange 19, which fits the inside of the tube 15, whereby the cap is held securely in place.

I have shown the tubular member 15 extending rearwardly with respect to the door 8, and this is believed to be the preferable arrangement, but since'member 15 is movable with respect to the spherical part 11, it may be rotated about the interior of the stove to the position that is the most desirable under the particular circumstances.

When the auxiliary grate is in place and surrounded by live coals in the manner shown in Fig. 1, air will enter through opening 7 and pass through the crate 9 into the space within member 11. Some of this air will pass through the slots 13 and into the bed of coal, while other portions thereof will pass upwardly thI ough the tube 15 and through slots 18 in cap 17 into the combustion chamber, where it will combine with the hot gases' and cause them to become completely oxidized, and in this manner gas explosions wiil be prevented. Since the air has access to such a large area of the fuel surface and can also enter the combustion chamber, the coal will be completely consumed and the fire will not die, even if a large amount of coal is put into the stove at once.

From the above, it is apparent that I have devised a stove that is especially well adapted to burn slack coal and to do this more effectively than a stove of ordinary construction.

I want to call particular attention to the fact that by providing the tubular member with a spherical cap 17, coal will not lodge on the same and choke the openings, as it would if the top were flat. This removes the danger of an explosion which might occur if the end of the tube 15 became clogged with coal. By my improved arrangement of parts, I secure a better and more thorough combustion of the coal and a thorough oxi dation of the gases, which results in a high thermal efficiency;

Having now described my invention, what I claim is- A stove comprising, in combination, a combustion chamber, a grate forming the bottom thereof, an auxiliary, substantially semi-spherical grate supported on the first named grate, said auxiliary grate having a plurality of slots along its surface, means for spacing the lower edges of this auxiliary grate from the upper surface of the grate, whereby air passages are formed, an opening in the top of the spherical grate, a tubular cylindrical member having its lower end of the proper size to fit said opening, a shoulder on the tubular member for engaging the top of the auxiliary grate, the upper end of the tubular member being of greater internal diameter. than the remaining part thereof, a semi-spherical-cap having a cylindrical portion whose outside diameter is slightly less than the inside diameter of the upper end of the tubular portion whereby it may be secured to the tubular member, said cap having a plurality of slots through which air may flow into the combustion chamber.

In testimony whereof I aflix my'si ROBERT E. JONES.

gnature. 

